The R8 as with most of the CM series has its barrel held on with grub screws. You would only be able to replace it with another CM style barrel. Traditional barrels that are attached with barrel nuts are not compatible with a CM's upper receiver.
Best bet is to pick one with a front end you like and mod the other parts to your taste 
James
__________________
B² Airsoft
Authorised Distributors of;
GHK, Wolverine, KWA, RA-Tech, PDI,
Smith Optics, Revision Military, Tasmanian Tiger, Airsoft Innovations, PTS Sydicate, Wouxun Radios, ASG, Nuprol, AIM, Line Of Fire, Mechanix, G&G, Venom Power, Fenix, BOL.
RWA Authorised Retailer
Custom Orders, Imports and Builds
http://b2airsoft.com
http://www.facebook.com/b2airsoft
|